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Current Question (ID: 8562)
Question:
\text{Assertion (A): In the presentation } E^{\ominus}_{\text{Fe}^{3+}/\text{Fe}^{2+}} \text{ and } E^{\ominus}_{\text{Cu}^{2+}/\text{Cu}}\text{, } \text{Fe}^{3+}/\text{Fe}^{2+} \text{ and } \text{Cu}^{2+}/\text{Cu} \text{ are redox couples.}
\text{Reason (R): A redox couple is the combination of the oxidised and reduced forms of a substance involved in an oxidation or reduction half cell.}
Options:
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1. $\text{Both (A) and (R) are True and (R) is the correct explanation of (A).}$
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2. $\text{Both (A) and (R) are True but (R) is not the correct explanation of (A).}$
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3. $\text{(A) is True but (R) is False.}$
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4. $\text{(A) is False but (R) is True.}$
Solution:
\text{Hint: Oxidation-reduction reaction, also called redox reaction.}
\text{A redox couple is defined as pair of compounds or elements having together the oxidised and reduced forms of it and taking part in an oxidation or reduction half-reaction.}
\text{So, } \text{Fe}^{3+}/\text{Fe}^{2+} \text{ and } \text{Cu}^{2+}/\text{Cu} \text{ are redox couples.}
\text{Analysis:}
\text{Assertion (A) Analysis: } \text{Fe}^{3+}/\text{Fe}^{2+} \text{ represents the oxidized form (}\text{Fe}^{3+}\text{) and reduced form (}\text{Fe}^{2+}\text{) of iron.}
\text{Similarly, } \text{Cu}^{2+}/\text{Cu} \text{ represents the oxidized form (}\text{Cu}^{2+}\text{) and reduced form (Cu) of copper.}
\text{Both pairs represent oxidized and reduced forms of the same element, so Assertion (A) is TRUE.}
\text{Reason (R) Analysis: The definition provided accurately describes what a redox couple is - the combination of oxidized and reduced forms of a substance in redox half-reactions.}
\text{Therefore, Reason (R) is TRUE.}
\text{Relationship: Reason (R) directly explains why the pairs mentioned in Assertion (A) are redox couples, making (R) the correct explanation of (A).}
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